Soybean cultivar 92160630750456

ABSTRACT

A novel soybean cultivar, designated 92160630750456, is disclosed. The invention relates to the seeds of soybean cultivar 92160630750456, to the plants of soybean 92160630750456 and to methods for producing a soybean plant produced by crossing the cultivar 92160630750456 with itself or another soybean variety. The invention further relates to hybrid soybean seeds and plants produced by crossing the cultivar 92160630750456 with another soybean cultivar.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinctive soybean cultivar, designated 92160630750456. There are numerous steps in the development of any novel, desirable plant germplasm. Plant breeding begins with the analysis and definition of problems and weaknesses of the current germplasm, the establishment of program goals, and the definition of specific breeding objectives. The next step is selection of germplasm that possess the traits to meet the program goals. The goal is to combine in a single variety an improved combination of desirable traits from the parental germplasm. These important traits may include higher seed yield, resistance to diseases and insects, better stems and roots, tolerance to drought and heat, and better agronomic quality.

Choice of breeding or selection methods depends on the mode of plant reproduction, the heritability of the trait(s) being improved, and the type of cultivar used commercially (e.g., F₁ hybrid cultivar, pureline cultivar, etc.). For highly heritable traits, a choice of superior individual plants evaluated at a single location will be effective, whereas for traits with low heritability, selection should be based on mean values obtained from replicated evaluations of families of related plants. Popular selection methods commonly include pedigree selection, modified pedigree selection, mass selection, and recurrent selection.

The complexity of inheritance influences choice of the breeding method. Backcross breeding is used to transfer one or a few favorable genes for a highly heritable trait into a desirable cultivar. This approach has been used extensively for breeding disease-resistant cultivars. Various recurrent selection techniques are used to improve quantitatively inherited traits controlled by numerous genes. The use of recurrent selection in self-pollinating crops depends on the ease of pollination, the frequency of successful hybrids from each pollination, and the number of hybrid offspring from each successful cross.

Each breeding program should include a periodic, objective evaluation of the efficiency of the breeding procedure. Evaluation criteria vary depending on the goal and objectives, but should include gain from selection per year based on comparisons to an appropriate standard, overall value of the advanced breeding lines, and number of successful cultivars produced per unit of input (e.g., per year, per dollar expended, etc.).

Promising advanced breeding lines are thoroughly tested and compared to appropriate standards in environments representative of the commercial target area(s) for three or more years. The best lines are candidates for new commercial cultivars; those still deficient in a few traits may be used as parents to produce new populations for further selection.

These processes, which lead to the final step of marketing and distribution, usually take from eight to 12 years from the time the first cross is made. Therefore, development of new cultivars is a time-consuming process that requires precise forward planning, efficient use of resources, and a minimum of changes in direction.

A most difficult task is the identification of individuals that are genetically superior, because for most traits the true genotypic value is masked by other confounding plant traits or environmental factors. One method of identifying a superior plant is to observe its performance relative to other experimental plants and to a widely grown standard cultivar. If a single observation is inconclusive, replicated observations provide a better estimate of its genetic worth.

The goal of plant breeding is to develop new, unique and superior soybean cultivars and hybrids. The breeder initially selects and crosses two or more parental lines, followed by repeated selfing and selection, producing many new genetic combinations. The breeder can theoretically generate billions of different genetic combinations via crossing, selfing and mutations. The breeder has no direct control at the cellular level. Therefore, two breeders will never develop the same line, or even very similar lines, having the same soybean traits.

Each year, the plant breeder selects the germplasm to advance to the next generation. This germplasm is grown under unique and different geographical, climatic and soil conditions, and further selections are then made, during and at the end of the growing season. The cultivars which are developed are unpredictable. This unpredictability is because the breeder's selection occurs in unique environments, with no control at the DNA level (using conventional breeding procedures), and with millions of different possible genetic combinations being generated. A breeder of ordinary skill in the art cannot predict the final resulting lines he develops, except possibly in a very gross and general fashion. The same breeder cannot produce the same cultivar twice by using the exact same original parents and the same selection techniques. This unpredictability results in the expenditure of large amounts of research monies to develop superior new soybean cultivars.

The development of new soybean cultivars requires the development and selection of soybean varieties, the crossing of these varieties and selection of superior hybrid crosses. The hybrid seed is produced by manual crosses between selected male-fertile parents or by using male sterility systems. These hybrids are selected for certain single gene traits such as pod color, flower color, pubescence color or herbicide resistance which indicate that the seed is truly a hybrid. Additional data on parental lines, as well as the phenotype of the hybrid, influence the breeder's decision whether to continue with the specific hybrid cross.

Pedigree breeding and recurrent selection breeding methods are used to develop cultivars from breeding populations. Breeding programs combine desirable traits from two or more cultivars or various broad-based sources into breeding pools from which cultivars are developed by selfing and selection of desired phenotypes. The new cultivars are evaluated to determine which have commercial potential.

Pedigree breeding is used commonly for the improvement of self-pollinating crops. Two parents which possess favorable, complementary traits are crossed to produce an F₁. An F₂ population is produced by selfing one or several F₁ 's. Selection of the best individuals may begin in the F₂ population; then, beginning in the F₃, the best individuals in the best families are selected. Replicated testing of families can begin in the F₄ generation to improve the effectiveness of selection for traits with low heritability. At an advanced stage of inbreeding (i.e., F₆ and F₇), the best lines or mixtures of phenotypically similar lines are tested for potential release as new cultivars.

Mass and recurrent selections can be used to improve populations of either self- or cross-pollinating crops. A genetically variable population of heterozygous individuals is either identified or created by intercrossing several different parents. The best plants are selected based on individual superiority, outstanding progeny, or excellent combining ability. The selected plants are intercrossed to produce a new population in which further cycles of selection are continued.

Backcross breeding has been used to transfer genes for a simply inherited, highly heritable trait into a desirable homozygous cultivar or inbred line which is the recurrent parent. The source of the trait to be transferred is called the donor parent. The resulting plant is expected to have the attributes of the recurrent parent (e.g., cultivar) and the desirable trait transferred from the donor parent. After the initial cross, individuals possessing the phenotype of the donor parent are selected and repeatedly crossed (backcrossed) to the recurrent parent. The resulting plant is expected to have the attributes of the recurrent parent (e.g., cultivar) and the desirable trait transferred from the donor parent.

The single-seed descent procedure in the strict sense refers to planting a segregating population, harvesting a sample of one seed per plant, and using the one-seed sample to plant the next generation. When the population has been advanced from the F₂ to the desired level of inbreeding, the plants from which lines are derived will each trace to different F₂ individuals. The number of plants in a population declines each generation due to failure of some seeds to germinate or some plants to produce at least one seed. As a result, not all of the F₂ plants originally sampled in the population will be represented by a progeny when generation advance is completed.

In a multiple-seed procedure, soybean breeders commonly harvest one or more pods from each plant in a population and thresh them together to form a bulk. Part of the bulk is used to plant the next generation and part is put in reserve. The procedure has been referred to as modified single-seed descent or the pod-bulk technique.

The multiple-seed procedure has been used to save labor at harvest. It is considerably faster to thresh pods with a machine than to remove one seed from each by hand for the single-seed procedure. The multiple-seed procedure also makes it possible to plant the same number of seeds of a population each generation of inbreeding. Enough seeds are harvested to make up for those plants that did not germinate or produce seed.

Descriptions of other breeding methods that are commonly used for different traits and crops can be found in one of several reference books (e.g., Allard, 1960; Fehr, 1987).

Proper testing should detect any major faults and establish the level of superiority or improvement over current cultivars. In addition to showing superior performance, there must be a demand for a new cultivar that is compatible with industry standards or which creates a new market. The introduction of a new cultivar will incur additional costs to the seed producer, the grower, processor and consumer; for special advertising and marketing, altered seed and commercial production practices, and new product utilization. The testing preceding release of a new cultivar should take into consideration research and development costs as well as technical superiority of the final cultivar. For seed-propagated cultivars, it must be feasible to produce seed easily and economically.

Soybean, Glycine max (L), is an important and valuable field crop. Thus, a continuing goal of plant breeders is to develop stable, high yielding soybean cultivars that are agronomically sound. The reasons for this goal are obviously to maximize the amount of grain produced on the land used and to supply food for both animals and humans. To accomplish this goal, the soybean breeder must select and develop soybean plants that have the traits that result in superior cultivars.

SUMMARY OF THE INVENTION

According to the invention, there is provided a novel soybean cultivar, designated 92160630750456. This invention thus relates to the seeds of soybean cultivar 92160630750456, to the plants of soybean 92160630750456 and to methods for producing a soybean plant produced by crossing the soybean 92160630750456 with itself or another soybean line.

DEFINITIONS

In the description and tables which follow, a number of terms are used. In order to provide a clear and consistent understanding of the specification and claims, including the scope to be given such terms, the following definitions are provided:

Seed Shape. Seed shape is described using ratios of the measurements of seed length, width, and thickness. Length=measurement of the seed with hilum positioned horizontally. Width=measurement of the seed with hilum placed vertically. Thickness=measurement of the seed with hilum placed either on the left or right margin. Seed shape is defined as Spherical (L/W, L/T, and T/W ratios=<1.2), Spherical Flattened (L/W ratio>1.2; L/T ratio=<1.2), Elongate (L/T ratio>1.2; T/W=<1.2), Elongate Flattened (L/T ratio>1.2; T/W>1.2).

Maturity Date. Plants are considered mature when 95% of the pods have reached their mature color. The number of days are either calculated from September 1 or from the planting date.

Seed Yield (Bushels/Acre). The yield in bushels/acre is the actual yield of the grain at harvest.

Lodging Resistance. Lodging is rated on a scale of 1 to 5. A score of 1 indicates erect plants. A score of 2.5 indicates plants are leaning at a 45° angle in relation to the ground and a score of 5 indicates plants are laying on the ground.

Phytophthora Tolerance. Tolerance to Phytophthora root rot is rated on a scale of 1 to 5, with a score of 1 being the best or highest tolerance ranging down to a score of 5 which indicates the plants have no tolerance to Phytophthora.

Emergence. This score indicates the ability of the seed to emerge when planted 3" deep in sand and with a controlled temperature of 25° C. The number of plants that emerge each day are counted. Based on this data, each genotype is given a 1 to 5 score based on its rate of emergence and percent of emergence. A score of 1 indicates an excellent rate and percent of emergence, an intermediate score of 2.5 indicates average ratings and a 5 score indicates a very poor rate and percent of emergence.

Iron-Deficiency Chlorosis. Plants are scored 1 to 5 based on visual observations. A score of 1 means no stunting of the plants or yellowing of the leaves and a score of 5 indicates the plants are dead or dying caused by iron-deficiency chlorosis, a score of 2.5 means plants have intermediate health with some leaf yellowing.

Brown Stem Rot. This is a visual disease score from 1 to 5 comparing all genotypes in a given test. The score is based on leaf symptoms of yellowing and necrosis caused by brown stem rot. A score of 1 indicates no symptoms. Visual scores range to a score of 5 which indicates severe symptoms of leaf yellowing and necrosis.

Shattering. The amount of pod dehiscence prior to harvest. Pod dehiscence involves seeds falling from the pods to the soil. This is a visual score from 1 to 5 comparing all genotypes within a given test. A score of 1 means pods have not opened and no seeds have fallen out. A score of 2.5 indicates approximately 50% of the pods have opened, with seeds falling to the ground and a score of 5 indicates 100% of the pods are opened.

Plant Height. Plant height is taken from the top of soil to top node of the plant and is measured in inches.

Seed Protein. The amount of crude protein in the seed on a % dry matter basis as determined by a near infrared reflectance spectrophotometer calibrated using seed crude protein content as measured by AOCS method BA4D-90.

Seed Oil. The amount of crude oil in the seed on a % dry matter basis as determined by a near infrared reflectance spectophotometer calibrated using seed crude oil content as measured by AOCS method BA3-38.

Seed Size. The average size of harvested seed expressed as grams per 100 seed.

Lipoxygenase-2 Activity. This is the activity of this enzyme as measured by the method as described by Hammond, et al in Crop Science (1992) 32:820-821.

Soymilk Yield and Tofu Yield. The amount of tofu produced using a standard method developed by the Illinois Crop Improvement Association. The method employs combining deionized water to 80 to 100 g of ground soybeans in a ratio of 1:6 (soybeans:water). The mixture is blended at high speed in a blender for 3 minutes. The resultant soybean-water slurry is cooked in steam for 4 minutes after the temperature reaches 98 C. The slurry is screened with a fruit juicer to obtain crude soymilk. The crude soymilk is filtered with 4 layers of #90 cheesecloth and then filtered again through Miracloth™. The filtrate was measured to determine soymilk yield and yield was expressed as ml/g dry matter. Tofu is prepared from the soymilk by adding 330 ml soymilk with 10% gluconic acid δ-lactone and cooking for 45 minutes at 85 C. The resulting tofu is refrigerated overnight and liquid is removed from the tofu by pressing. Tofu yield is determined following removal of the liquid and expressed on a weight basis.

Tofu Strength. The resistance to penetration of tofu as measured using an Instron™ Universal Testing Machine. Strength is expressed on a g/cm² basis.

Soymilk Solids Content. The solids content of soymilk as determined using the method described in 14th Edition, AOAC Official Methods of Analysis, 1984, William, S., Editor. Association of Official Analytical Chemists. Washington, D.C.

Soymilk Protein Content. Protein content of soymilk as determined using AOCS Methods, 42.014 (1970), and 2.057 (1984) Official Methods of Analysis. Association of Official Analytical Chemists, Washington, D.C.

DETAILED DESCRIPTION OF THE INVENTION

Soybean cultivar 92160630750456 has superior characteristics and was developed from the cross A231 QT x A2506. F₂ and F₃ plants were advanced by a modified single seed descent selection. F₃ derived F₄ lines were selected in 1993 and entered in a six location preliminary yield trial In 1994. In 1995 the line was advanced to an eight location yield trial.

92160630750456 is a mid-maturity group II variety with the Rps1c gene for multirace Phytophthora Root Rot resistance. It has very good yield potential, compared to Vinton 81, a standard in the soyfood industry. Since 92160630750456 is missing the lipoxygenase-2 enzyme, it has a much less beany flavor compared to conventional soybean varieties. It has greater than average seed size and protein content.

Some of the criteria used to select in various generations include: seed yield, seed protein content, seed size, lodging resistance, emergence, disease tolerance, maturity, late season plant intactness, plant height and shattering resistance.

The cultivar has shown uniformity and stability for the traits, as described in the following variety description information. It has been self-pollinated a sufficient number of generations with careful attention to uniformity of plant type. The line has been increased with continued observation for uniformity.

Soybean cultivar 92160630750456 has the following morphologic and other characteristics (based primarily on data collected at Ames, Iowa):

VARIETY DESCRIPTION INFORMATION

1. Seed Shape: Spherical Flattened (L/W ratio>1.2; L/T ratio=<1.2)

2. Seed Coat Color: (Mature Seed)--Yellow

3. Seed Coat Luster: (Mature Hand Shelled Seed)--Dull

4. Seed Size: (Mature Seed)--22 grams per 100 seeds

5. Hilum Color: (Mature Seed)--Yellow

6. Cotyledon Color: (Mature Seed)--Yellow

7. Flower Color: Purple or White

8. Leaflet Shape: Ovate

9. Leaflet Size: Medium

10. Leaf Color: Medium Green

11. Pod Color: Tan

12. Plant Pubescence Color: Gray

13. Plant Types: Slender

14. Plant Habit: Indeterminate

15. Maturity Group: II

16. Disease Reaction:

    ______________________________________                                         Phytophthora Rot (Phytophthora megasperma var. sojae):                                Race 1                                                                               Resistant                                                                Race 2                                                                               Resistant                                                                Race 3                                                                               Resistant                                                                Race 6                                                                               Resistant                                                                Race 7                                                                               Resistant                                                                Race 8                                                                               Resistant                                                                Race 9                                                                               Resistant                                                                Race 10                                                                              Resistant                                                                Race 11                                                                              Resistant                                                                Race 13                                                                              Resistant                                                                Race 15                                                                              Resistant                                                                Race 17                                                                              Resistant                                                                Race 21                                                                              Resistant                                                                Race 23                                                                              Resistant                                                                Race 24                                                                              Resistant                                                                Race 26                                                                              Resistant                                                                Race 27                                                                              Resistant                                                         Soybean Cyst Nematode (Heteroderaglycines): Susceptible                        ______________________________________                                    

17. Plant Lodging Score: 2.2

18. Plant Height: 89 cm

19. Seed Protein Content: 43

20. Seed Oil Content: 19

21. Seed Size: 22.4

22. Lipoxygenase-2 Activity: 0

23. Soymilk Yield: 5.2

24. Tofu Yield: 343

25. Tofu Strength: 18.3

26. Soymilk Solids Content: 11.1

27. Soymilk Protein Content: 50.9

This invention is also directed to methods for producing a soybean plant by crossing a first parent soybean plant with a second parent soybean plant, wherein the first or second soybean plant is the soybean plant from the line 92160630750456. Further, both first and second parent soybean plants may be from the cultivar 92160630750456. Therefore, any methods using the cultivar 92160630750456 are part of this invention: selfing, backcrosses, hybrid breeding, and crosses to populations. Any plants produced using cultivar 92160630750456 as a parent are within the scope of this invention. As used herein, the term "plant" includes plant cells, plant protoplasts, plant cells of tissue culture from which soybean plants can be regenerated, plant calli, plant clumps, and plant cells that are intact in plants or parts of plants, such as pollen, flowers, seeds, pods, leaves, stems, and the like. Thus, another aspect of this invention is to provide for cells which upon growth and differentiation produce the cultivar 92160630750456.

The cultivar 92160630750456 is similar to A2506. While similar, there are numerous differences including: 92160630750456 does not have the Lipoxygenase-2 enzyme while A2506 presents the enzyme. The hilum color of 92160630750456 is yellow while A2506 has a black hilum.

The grain from cultivar 92160630750456 is similar to that from Vinton 81. The grain from 92160630750456 displays similar qualities for the manufacture of tofu and soymilk to that from Vinton 81 and HP204. While similar, there are numerous differences including: 92160630750456 does not have the Lipoxygenase-2 enzyme while Vinton 81 contains the enzyme. In addition, 92160630750456 displays superior yield potential to Vinton 81.

TABLES

In Table 1 that follows, the traits and characteristics of soybean cultivar 92160630750456 are compared to several competing varieties of commercial soybeans of similar maturity. In this table, column 1 shows the Competitor Variety. Column 2 and 3 indicate the number of tests and years of testing. Column 4, 5 and 6 indicate the yield in bushels/acre for the instant invention, the Competitor Variety identified in column 1 and the difference, respectively. Column 7 and 8 indicate the days to maturity for the instant invention and Competitor Variety, respectively. Column 9 and 10 show plant height of the instant invention and Competitor Variety. Column 11 and 12 show the lodging score for the instant invention and the Competitor Variety respectively. Lodging scores are rated 1=Best and 5=Worst.

In Table 2 that follows, the grain quality characteristics of soybean cultivar 92160630750456 are compared to several competing varieties of commercial soybeans of similar maturity. In this table, column 1 shows the varieties being compared. Column 2 indicates the seed size, column 3 shows the percent of seed protein content and column 4 shows the percent of seed oil content.

In Table 3 that follows, the soyfood quality characteristics of soybean cultivar 92160630750456 are compared to several competing varieties of commercial soybeans of similar maturity. In this table, column 1 shows the varieties being compared. Column 2 indicates the Tofu Yield, column 3 shows the Tofu Strength, column 4 shows the Soymilk Yield, column 5 indicates the Soymilk Solids and column 6 shows the Soymilk Protein.

                                      TABLE 1                                      __________________________________________________________________________     92160630750456 (`456 BELOW) VS. COMPETITOR VARIETIES                           ALL YEARS                                                                      Competitor                                                                     Variety                                                                               Number                                                                               Yield, Bushel/Acre                                                                      Maturity                                                                             Height                                                                               Lodging                                      (Other)                                                                               Tests                                                                             Years                                                                             `456                                                                              Other                                                                             Diff.                                                                             `456                                                                              Other                                                                             `456                                                                              Other                                                                             `456                                                                              Other                                     __________________________________________________________________________     Asgrow A1900                                                                          7  2  56.5                                                                              58.8                                                                              -2.3                                                                              22.1                                                                              18.0                                                                              34.0                                                                              30.6                                                                              2.0                                                                               1.6                                       Asgrow A2242                                                                          7  2  56.5                                                                              61.6                                                                              -5.1                                                                              22.1                                                                              23.8                                                                              34.0                                                                              31.5                                                                              2.0                                                                               1.7                                       Asgrow A2247                                                                          7  2  56.5                                                                              62.5                                                                              -6.0                                                                              22.1                                                                              21.2                                                                              34.0                                                                              34.9                                                                              2.0                                                                               1.7                                       VINTON 81                                                                             7  2  56.5                                                                              50.7                                                                              5.8                                                                               22.1                                                                              20.9                                                                              34.0                                                                              36.9                                                                              2.0                                                                               3.1                                       Asgrow A2722                                                                          7  2  56.5                                                                              66.7                                                                              -10.2                                                                             22.1                                                                              28.2                                                                              34.0                                                                              35.0                                                                              2.0                                                                               2.0                                       __________________________________________________________________________

                  TABLE 2                                                          ______________________________________                                         Grain Quality Characteristics of 92160630750456                                (`456 BELOW) VS. COMPETITOR VARIETIES                                          1995 Asgrow Research Trials, 7 to 9 Locations                                           Seed        Seed Protein                                                                             Seed Oil                                        Variety  Size        Content   Content                                         ______________________________________                                         `456     22.4        43        19                                              Vinton81 21.8        43        19                                              A2506    14.6        40        20                                              Stine 2250                                                                              14.7        40        21                                              ______________________________________                                    

                  TABLE 3                                                          ______________________________________                                         Soyfood Quality Characteristics of 92160630750456                              (`456 BELOW) VS. COMPETITOR VARIETIES                                          1995 Illinois Crop Improvement Soyfoods Evaluations,                           3 Replicated Trials                                                                    Tofu    Tofu      Soymilk                                                                               Soymilk                                                                               Soymilk                                Variety Yield   Strength  Yield  Solids Protein                                ______________________________________                                         `456    343     18.3      5.2    11.1   50.9                                   Vinton81                                                                               343     19.7      5.2    11.7   51.2                                   A231QT  332     22.7      4.8    11.7   50.3                                   HP204   328     18.9      4.8    11.9   49.8                                   ______________________________________                                    

DEPOSIT INFORMATION

A deposit of the Asgrow Seed Company soybean cultivar 92160630750456 disclosed above and recited in the appended claims has been made with the American Type Culture Collection (ATCC), 10801 University Boulevard, Manassas, Va. 20110 The date of deposit was May 21, 1999. The deposit of 2,500 seeds were taken from the same deposit maintained by Asgrow Seed Company since prior to the filing date of this application. All restrictions upon the deposit have been removed, and the deposit is intended to meet all of the requirements of 37 C.F.R. §1.801-1.809. The ATCC accession number is ATCC PTA-98. The deposit will be maintained in the depository for a period of 30 years, or 5 years after the request, or for the effective life of the patent, whichever is longer, and will be replaced as necessary during that period.

Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity and understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the invention, as limited only by the scope of the appended claims. 

What is claimed is:
 1. A soybean seed designated 92160630750456, deposited as ATCC Accession Number PTA-98.
 2. A plant or plants of the soybean cultivar designated 92160630750456 produced by growing the seed of claim
 1. 3. The plant of claim 2 wherein said plant has a flower color of white.
 4. Pollen of the plant of claim
 2. 5. Ovule or ovules of the plant of claim
 2. 6. A soybean plant having all of the physiological and morphological characteristics of the soybean plant of claim
 2. 7. Tissue culture of the plant of claim
 2. 8. A soybean plant regenerated from the tissue culture of claim 7, wherein the regenerated soybean plant has all of the physiological and morphological characteristics of a plant grown from a soybean seed designated
 92160630750456. 9. A method for producing a hybrid soybean seed comprising crossing a first parent soybean plant with a second parent soybean plant and harvesting the resultant hybrid soybean seed, wherein said first or second parent soybean plant is the soybean plant of claim
 2. 10. A first generation (F₁) hybrid soybean plant produced by growing said hybrid soybean seed of claim
 9. 11. Seed of the plant of claim
 10. 12. Tissue culture of the seed of claim
 1. 13. A soybean plant regenerated from the tissue culture of claim 12, wherein the regenerated soybean plant has all of the physiological and morphological characteristics of a plant grown from a soybean seed designated
 92160630750456. 